Table III. Organizational Mechanics or Maintenance Crews C and D

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TM-9-8240 12-Ton 4-Wheel Wrecklerlow-Bed Semitrailers M9 M270 and M270A1 Manual

Table III. Organizational Mechanics or Maintenance Crews C and D (cont)

ices. Very often it will be found that a particular procedure

does not apply to both scheduled maintenances. In order to

determine

which

procedure

follow,

look

down

the

column

corresponding

the

maintenance

procedure,

and

wherever

item appears,

perform

the

operations

indicated

opposite

the

number.

Table III. Organizational Mechanics or Maintenance Crews C and D

Preventive-Maintenance

Services.

INSPECTION AND ROAD TEST

Note. When the tactical situation does not permit a full road

test, perform only those items that require little or no movement of

the semitrailer. When a road test can be made, it should be

approximately 3 miles but not over 5 miles.

Before operation: Tires, general visual inspection of

semitrailer and equipment. Perform the before-opera-

tion service (par.43).

Air pressure. With breaking systems of towing vehicle

and semi trailer proper] y connected, inspect for leaks

in the semitrailer air brake system by stopping the

engine when the air pressure is at a maximum and

noticing if there is any appreciable drop on the air

pressure gage within 1 minute.

Brakes braking effect, feel, side pull, noise, chatter,

p e d a l travel, and hand control. Apply semitrailer

brakes alone and observe if they operate effectively.

Disconnect hose from towing vehicle and see if semi-

trailer. brakes apply.

Unusual noises-attachments, body, and wheels. At all

times during the road test, be alert for unusual or

excessive noises that may indicate looseness, defects,

or dificient lubrication in these components.

Lamps-tail, clearance, stop, and blackout. During stops

in the road test, test the operation of these exterior

lights. Note condition of lights and safety reflectors.

AFTER ROAD TEST

T e m p e r a t u r e s - b r a k e drums, hubs. Immediately after

the road test, feel these units cautiously. An overheated

wheel hub and brake drum indicates an improperly

adjusted, defective, or dry wheel bearing, or a drag-

ging brake. An abnormally cool condition indicates

an inoperative brake.

TAGO 1321B